This is a really unimportant thing I stumbled across, but I figure it's better to at least post it (while waiting a few hours to repost the thread I put in suggestions because automod/spam filter ate it for daring to be too big. Again. And it won't bring it back because it never brought back the last one I put up that was half the size.) instead of letting it just sit and not raising it. Simple bug, no gameplay impact, just a slight tickle at the back of the brain:
The "sword trail" of Brilliant Cleave is correctly colored by the device color, but the light half of the light-blue-and-black Therakiel particles themselves do not change to match the device color. That's all, really.